弹塑性阻尼支座用于自锚式悬索桥减震设计

ElasticPlastic Energy Dissipating Bearing for Seismic Design of Selfanchored Suspension Bridge with Single Tower

摘要:

对南京夹江自锚式悬索桥采用弹塑性阻尼支座进行减隔震设计，并采用非线性动力时程分析方法，对阻尼支座屈服荷载进行了参数敏感性分析.计算结果显示:设置阻尼支座以后，主梁纵向位移减小为飘浮体系的20％，内力则与飘浮体系地震反应相当;横向地震反应也仅为墩梁、塔梁横向固定体系的15％～50％.表明弹塑性阻尼支座可以非常有效地用于独塔自锚式悬索桥减隔震设计.

Abstract:

A new kind of elasticplastic energy dissipating bearing is applied to the seismic isolation design of the Nanjing Jia River Bridge, a typical selfanchored suspension bridge with single tower. Parameter sensitivity analysis are conducted for the bearing design through nonlinear dynamic timehistory analysis. The results show that compared with the responses of the floating type, the longitudinal displacement of main girder is reduced to 20% while the inner forces are almost as the same. The lateral seismic responses are also reduced to 15%~50% of the conventional lateralfixed system. It indicates that the elasticplastic energy dissipating bearing can be effectively applied to the seismic isolation design of selfanchored suspension bridge with singletower.